Anti–glomerular basement membrane (GBM) nephritis is characterized by circulating anti-GBM antibodies and crescentic glomerulonephritis (GN) with deposition of IgG along the GBM. In a limited number of cases, glomerular immune complexes have been identified in anti-GBM nephritis. A 38-year-old female presented azotemia, hematuria, and proteinuria without any pulmonary symptoms. A renal biopsy showed crescentic GN with linear IgG deposition along the GBM and mesangial IgA deposition. The patient was diagnosed as concurrent anti-GBM nephritis and IgA nephropathy. Therapies with pulse methylprednisolone and cyclophosphamide administration were effective. Concurrent cases of both anti-GBM nephritis and IgA nephropathy are rare among cases of anti-GBM diseases with deposition of immune complexes. This rare case of concurrent anti-GBM nephritis and IgA nephropathy with literature review is noteworthy.
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BACKGROUND Osteopontin (OPN) is a cytokine associated with a cell-matrix via integrins. Fibroblast specific protein-1 (FSP-1), known as S100A4, has been implicated in cell migration by non-muscle myosin. We investigated whether the role of OPN and FSP-1/S100A4 expression in their contribution to the podocyte phenotype change to form podocyte bridge and cellular crescent. METHODS Glomerular expression of OPN and FSP-1/S100A4 in renal biopsies of 16 patients with crescentic glomerulonephritis (CrGN) and 13 normal renal biopsies were studied by immunohistochemistry. RESULTS The expression of OPN and FSP-1/S100A4 was increased in the podocytes of glomeruli, with and without crescents, in patients with CrGN. Neither OPN nor FSP-1/S100A4 was expressed in glomeruli from the normal controls (p<0.01). A significant positive correlation was found between the expression of OPN in glomerular tufts and cellular crescents, and the expression of OPN and FSP-1/S100A4 in glomerular tufts (p<0.05). CONCLUSIONS The results suggest that OPN plays a role in early podocyte attachment to Bowman's capsule, and FSP-1/S100A4 potentiate podocyte contribution to cellular crescent formation by inducing cellular migration and growth.
It has been postulated that programmed cell death via apoptosis may be critical for remodelling of glomeruli after inflammatory injury. To understand the regulatory mechanism of apoptosis in experimental crescentic glomerulonephritis (CGN), we examined the MIB-1 score (proliferation index, PI) and apoptotic index during the progression of experimental CGN to end-stage renal failure. CGN was induced in New Zealand White rabbits by administration of guinea pig anti-GBM IgG after sensitization with guinea pig IgG and their kidneys were analyzed for the development of crescents through sequential renal biopsies. Serum creatinine levels progressively increased in a time course until day 45. The PI in glomeruli, tubular epithelial cells, and interstitium progressively increased during the progression of experimental CGN. The mean numbers of MIB-1 positive intraglomerular nuclei (PI) were significantly correlated with degrees of crescent formation and the numbers of apoptotic cells in the glomeruli, tubules, and interstitium.
Significant apoptosis was present from day 1 (15.8 10.16 cells/glomerular cross section) and increased in number with the proliferative lesions as glomerular inflammation continued. Moreover, apoptosis increased during the resolution of the glomerular inflammation, and many apoptotic cells were present in the sclerotic lesions in day 17 (18.6 12.99 cells/glomerular cross section). As glomerular inflammation subsided, cellular crescents progressed to fibrous crescents with a reduction of cellularity by day 45. On day 45, the glomerular PI and the numbers of apoptotic cells were markedly decreased. The correlations found in CGN between the creatinine level and the percentage of crescents, between the percentage of crescent and PI, and between the PI and number of apoptotic cells support the hypothesis that there is a change in the glomerular and tubulo-interstitial apoptosis under pathologic conditions. These findings indicate that apoptosis plays an essential role in the resolution of intra- and extraglomerular inflammation and in the elimination of glomerular cells within the sclerotic regions for progressive CGN. The regulation of the apoptotic phenomenon and increased PI during CGN may be important in the progression of glomerular inflammation and the development of pathologic glomerular sclerosis.
Accumulation of leukocytes within the glomerulus is a key event in the pathogenesis of glomerulonephritis. This process is mediated by pairs of adhesion molecules. We have examined the expression pattern of selectins (E and P), intercellular adhesion molecule-1 (ICAM-1), and vascular cell adhesion molecule-1 (VCAM-1) in 30 renal biopsies with IgA nephropathy, diffuse crescentic glomerulonephritis, and minimal change disease.
Normal controls were obtained from four nephrectomy specimens with renal cell carcinoma. ICAM-1 expression was significantly increased in the glomerular endothelial and mesangial cells in cases with IgA nephropathy compared with normal controls. VCAM-1 was expressed in glomerular mesangial cells in all cases with IgA nephropathy and diffuse crescentic glomerulonephritis, but faintly expressed in 3 cases with minimal change disease and not expressed in normal controls. P-selectin was faintly expressed in the glomeruli in cases with IgA nephropathy and diffuse crescentic glomerulonephritis. E-selectin was only expressed in the vascular endothelium in one case with IgA nephropathy and in the other with diffuse crescentic glomerulonephritis. ICAM-1 and VCAM-1 were strongly expressed in the crescents. However, selectin was not expressed in the crescent. These results suggest that adhesion molecules, particularly ICAM-1 and VCAM-1, play an important role in the pathogenesis of glomerular damage and crescent formation in primary glomerular diseases.
Crescentic glomerulonephritis in rheumatoid arthritis is described recently with increasing frequency. It can occur directly as a manifestation of rheumatoid arthritis or may be a reaction to drugs such as D-penicillamine and bucillamine. We report a case of crescentic glomerulonephritis in a 46-year-old woman with rheumatoid arthritis for 20 years who had been treated intermittently with herb medicine or nonsteroidal anti-inflammatory drugs (NSAIDS). Light microscopic examination showed severe focal segmental and global necrotizing glomerulonephritis with crescent formation in 50% of the glomeruli.
Immunofluorescent study revealed scanty amount of mesangial granular deposits of IgA, IgM, C3 and fibrinogen in a diffuse pattern.